From f7ee3b772d9de87387a725caa04bc041ac7fe5ec Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Tue, 2 Aug 2022 15:48:50 -0400 Subject: [PATCH] NFSv4/pnfs: Fix a use-after-free bug in open commit 2135e5d56278ffdb1c2e6d325dc6b87f669b9dac upstream. If someone cancels the open RPC call, then we must not try to free either the open slot or the layoutget operation arguments, since they are likely still in use by the hung RPC call. Fixes: 6949493884fe ("NFSv4: Don't hold the layoutget locks across multiple RPC calls") Signed-off-by: Trond Myklebust Signed-off-by: Greg Kroah-Hartman --- fs/nfs/nfs4proc.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 76157d31310f..7c5dfed0437f 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -3039,12 +3039,13 @@ static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, } out: - if (opendata->lgp) { - nfs4_lgopen_release(opendata->lgp); - opendata->lgp = NULL; - } - if (!opendata->cancelled) + if (!opendata->cancelled) { + if (opendata->lgp) { + nfs4_lgopen_release(opendata->lgp); + opendata->lgp = NULL; + } nfs4_sequence_free_slot(&opendata->o_res.seq_res); + } return ret; }